I 



254 The Ottawa Naturalist. [March 



superficial, and do not intersect the diaphragms to form con- 

 tinuous vertical leaves. The number of lamellee in calyces of about 

 two and a half inches diameter is 150 to 160, half of which are 

 of the smaller size. Found in the upper Helderberg limestones 

 of Michigan, Canada, Ohio, and in the Western States." 



Locality and formation. — At Rama's farm, Cayuga, and at 

 other localities in Ontario ; Corniferous formation. 



Zaphrentis Minas, Dawson. 



Zaphrentis Minas, pars, Dawson. 1868. Acadian Geology, second 

 edition, p. 286 (small specimens,) fig. 84a. 



Corallum simple, turbinate, small, slightly curved, about twice 

 as long as broad, pointed below and obscurely marked transversely 

 by low accretion ridges. Epitheca complete, with distinct longi- 

 tudinal septal furrows and fine, close-set, transverse growth 

 lines shewing on the surface. Calyx deep, with thin vertical 

 walls and a moderately flat bottom, the depth equal to more 

 than one-half the width. Tabulse rather irregular, crossing from 

 side to side, with minor incomplete tabulae at times resting on 

 the principal ones Septa, from about sixty-five to seventy-five 

 in number, alternately long and short, the long ones passing to 

 the centre, the remainder only about i mm. in length ; on the 

 walls of the calyx the primaries are reduced to thin sharp 

 edged ridges and the secondaries become almost obsolete, 

 Fossette of moderate depth, extending outward to the wall on 

 the flat or concave side of the coral. 



The figure accompanying the original description does not 

 convey a correct idea of the depth and forin of the calyx ; the 

 specimen from which the drawing was evidently made is 40 mm 

 in length along the convex curve, about 23 mm. in maximum 

 breadth near the top and the calyx, as seen in a longitudinal 

 section of the corallum, is about 12 mm. deep. 



Locality and formation. — West River, Pictou, N.S., collected 

 by Professor How ; lower Carboniferous formation. Two small 

 specimens and the basal extremity of a third the property of the 

 Redpath Museum, McGill University, Montreal. 



